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The article you read was most likely about Adrian Lamo. He's received a lot of press lately (mostly because he hacked into the New York Times and they decided to press charges) and it's true that he only uses a web browser to find his way into corporate networks. You can read more about his adventures here:

It's not rocket science, but it is illegal so don't get any ideas . As for your third question "why arent so many crackers hacking using it", the answer is, they are. A web browser is just one of many tools in an attacker's toolbox.

Just a quick note again about crackers. Everyone seems to portray crackers as bad and evil people who destroy everything. Well, that may be true, but, without crackers, we'd have no need to secure software, we'd have no need for securing our networks, that entire job market would be gone. I'm not saying that crackers are good, and I hate it when lamers DDoS some server because that's awfully lame. I do have some respect for software crackers as it generally takes more skill to crack a piece of software than to d/l skiddie tools. I have even more respect for the people that identify problems with systems and offer fixes. Both blackhats and whitehats have a great deal of knowledge about programming, networking, security, and whatnot, but we clearly see that knowledge is two-sided here. I don't feel that crackers are bad, I feel that they're a necessary evil.

Is there a sum of an inifinite geometric series? Well, that all depends on what you consider a negligible amount.